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Testing of identity, strength, quality and purity of pharmaceuticals such as drug substances, excipients and products requires them to be compared with a substance which is highly purified and characterized. The US Pharmacopeia (USP) defines reference standard materials as "highly…
Going by the classical definition, an impurity can be defined as an unwanted chemical substance which differs from the chemical composition of the material in question. In pharmaceutical preparations, impurities identification, assessment and quantification play a vital role in evaluating…